package model;

import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;


/**
 * \* Created with IntelliJ IDEA.
 * \* User: Administrator
 * \* Date: 2022/6/14
 * \* Time: 18:43
 * \* To change this template use File | Settings | File Templates.
 * \* Description:
 * \
 */
public class DBUtil {
    private static final String URL = "jdbc:mysql://127.0.0.1:3306/java102_blog2?characterEncoding=utf8&useSSL=false";
    private static final String USERNAME = "root";
    private static final String PASSWORD = "123456";

    private static volatile DataSource dataSource = null;

    private static DataSource getDataSource() {
        if (dataSource == null) {
            synchronized (DBUtil.class) {
                if (dataSource == null) {
                    dataSource = new MysqlDataSource();
                    ((MysqlDataSource)dataSource).setUrl(URL);
                    ((MysqlDataSource)dataSource).setUser(USERNAME);
                    ((MysqlDataSource)dataSource).setPassword(PASSWORD);
                }
            }
        }
        return dataSource;
    }


    public static Connection getConnection() throws SQLException {
        return getDataSource().getConnection();
    }

    public static void close (Connection connection, PreparedStatement statement,ResultSet resultSet){
        if(resultSet != null){
            try {
                resultSet.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(statement != null){
            try {
                statement.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(connection != null){
            try {
                connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}
